<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <em>定义着重文字</em>
    <strong>定义加重语气</strong>
    <span>元素没有特定的含义</span>
    <b>定义粗体文本</b>
    <i>定义斜体字</i>
    <del>定义删除线</del>
</body>
</html>